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Announcement: Introducing HL7137: High-Efficiency, Low Voltage, Fast Charging IC for Li-Ion and Li-Polymer Batteries


HL8743 features a high input voltage single low-dropout regulator (HL8743SC01 / HL8743SC03) / dual channel low-dropout regulator (HL8743SC02 / HL8743SC04) with accurate current sensing, designed to operate with a wide input voltage range from 4.5V to 40V. The device has 45V load dump protection at power input pin. These devices provide power to the low-noise amplifiers of the active antenna through a coaxial cable with 350mA per channel current. Each channel provides an adjustable output voltage from 1.5V to 20V through resistor divider on FB pin.

These devices provide diagnostics through the current sense and nERR pins. To monitor the load current, a high-side current sense circuitry provides a proportional analog output to the sensed load current. The accurate current sense allows detection of open, normal and short-circuit conditions without the need for further calibration. Current sense can be multiplexed between channels to save analog-to-digital converter (ADC) resources. Each channel also implements adjustable current limit with an external resistor on each LIM pin.

For more detailed description of the device, please download a product brief.


  • Single and Dual-Channel LDO with current sense and adjustable current limit
  • Wide input voltage range: 4.5V to 40V
  • 45V Load dump
  • Adjustable LDO VOUT: 1.5V to 20V
  • Power load switch mode by shorting FB to GND
  • Up to 350mA Output current
  • Adjustable Current-Limit with external Resistor
  • High Accuracy Current-Sense to Detect Antenna Open Condition at Low Current
  • High PSRR: 80dB at 100Hz
  • Reverse-Polarity protection, down to – 40V
  • 500mV max dropout voltage at 100mA load
  • Stable with wide output capacitor, 2.2uF to 100uF (ESR 1mΩ to 5Ω)

Block Diagram

HL8743 - HMI Main Photo

For more information or a full datasheet request, please contact the factory at

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